That's right. You have to add images separately in all the notifications. Probably, you can add an image in one of your notifications. You will get the sys_id of the image stored in the 'sys_attachment' table. You can use the same source link in your next notification.
If you don't want to repeat the same activity in every notification then better add an email template , add an image there in the template and use the same email template in the notifications where you have to add the image.
If my response has helped you , mark it as helpful and accept the solution.
Regards,
Nayan
